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If f(x)=sin([x]pi)/(x^2+x+1)where [.] d...

If `f(x)=sin([x]pi)/(x^2+x+1)`where [.] denotes the greatest integer function, then (A) f is one-one (B) f is not one-one and not constant (C) f is a constant function (D) none of these

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